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defect passivation by nontoxic biomaterial yields 21% efficiency perovskite solar cells

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Journal of Energy Chemistry 2021年第4期30卷 265-271页

作者： Shaobing Xiong Tianyu Hao Yuyun Sun Jianming Yang Ruru Ma Jiulong Wang Shijing Gong Xianjie Liu Liming Ding Mats Fahlman Qinye Bao Key Laboratory of Polar Materials and Devices Department of Electronic ScienceSchool of Physics and Electronic ScienceEast China Normal UniversityShanghai 200241China School of Chemistry and Chemical Engineering Shanghai Jiao Tong UniversityShanghai 200025China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006ShanxiChina Laboratory of Organic Electronics ITNLinköping UniversitySE-60174 NorrköpingSweden Wallenberg Wood Science Center Linköping UniversitySE-60174 NorrköpingSweden Center for Excellence in Nanoscience(CAS) Key Laboratory of Nanosystem and Hierarchical Fabrication(CAS)National Center for Nanoscience and TechnologyBeijing 100190China

defect passivation is one of the most important strategies to boost both the efficiency and stability of perovskite solar cells(PSCs).Here,nontoxic and sustainable forest-based biomaterial,betulin,is first introduced into *** experiments and calculations reveal that betulin can effectively passivate the uncoordinated lead ions in perovskites via sharing the lone pair electrons of hydroxyl group,promoting charge *** a result,the power conversion efficiencies of the p-i-n planar PSCs remarkably increase from 19.14%to 21.15%,with the improvement of other *** hydrogen bonds of betulin lock methylamine and halogen ions along the grain boundaries and on the film surface and thus suppress ion migration,further stabilizing perovskite crystal *** positive effects enable the PSCs to maintain 90%of the initial efficiency after 30 days in ambient air with 60%±5%relative humidity,75%after 300 h aging at 85℃,and 55%after 250 h light soaking,*** work opens a new pathway for using nontoxic and low-cost biomaterials from forest to make highly efficient and stable PSCs.

关键词： Perovskite solar cells defect passivation Nontoxic biomaterial Efficiency

defect passivation through electrostatic interaction for high performance flexible perovskite solar cells

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Journal of Energy Chemistry 2020年第7期29卷 173-177,I0006页

作者： Deyu Xin Shujie Tie Xiaojia Zheng Jianguo Zhu Wen-Hua Zhang Department of Materials Science Sichuan UniversityChengdu 610064SichuanChina Sichuan Research Center of New Materials Institute of Chemical MaterialsChina Academy of Engineering PhysicsChengdu 610200SichuanChina

The light weight,good bending resistance and low production cost make flexible perovskite solar cells(PSCs)good candidates in wearable electronics,portable charger,remote power,and flying *** power conversion efficiency(PCE)plays a crucial role on obtaining the high mass specific power of flexible ***,the performance for flexible PSCs is still having a large room to be ***,we added the 2-amino-5-cyanopyridine(ACP)molecule with a polar electron density distribution in the perovskite precursor solution to improve the performance of flexible *** cyano groups with electron-withdrawing ability are expected to passivate positively charged point defects,while amines with electron donating ability are expected to passivate negatively charged point defects in perovskite *** to the effective passivation of defects at the grain boundary and surface of perovskite films,the PCE of flexible PSCs is obviously increased from 16.9%to 18.0%.These results provide a universal approach to improve performance of flexible PSCs by healing the defects in perovskite films through electrostatic interactions.

关键词： Perovskite solar cell Flexible Electrostatic interaction defect passivation Recombination

defect passivation with potassium trifluoroborate for efficient spray-coated perovskite solar cells in air

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Journal of Semiconductors 2022年第9期43卷 25-33页

作者： Chen Gao Hui Wang Pang Wang Jinlong Cai Yuandong Sun Cong Yu Teng Li Xiaoshuai Zhang Dan Liu Tao Wang School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China

defects as non-radiative recombination centers hinder the further efficiency improvements of perovskite solar cells(PSCs).Additive engineering has been demonstrated to be an effective method for defect passivation in perovskite ***,we employed(4-methoxyphenyl)potassium trifluoroborate(C_(7)H_(7)BF_(3)KO)with and K+functional groups to passivate spray-coated(FAPbI_(3))_(x)(MAPbBr_(3))_(1-x) perovskite and eliminate *** is shown that the F of can form hydrogen bonds with the H atom in the amino group of MA+/FA+ions of perovskite,thus reducing the generation of MA+/FA+vacancies and improving device ***,K+and reduced MA+/FA+vacancies can inhibit ion migration,thereby eliminating *** the aid of C_(7)H_(7)BF_(3)KO,we obtained hysteresis-free PSCs with the maximum efficiency of 19.5%by spray-coating in *** work demonstrates that additive engineering is promising to improve the performance of spray-coated PSCs.

关键词： perovskite solar cells spray-coating additive engineering defect passivation hysteresis

defect passivation and electrical conductivity enhancement in perovskite solar cells using functionalized graphene quantum dots

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Materials Futures 2022年第4期1卷 121-132页

作者： Yichuan Rui Zuoming Jin Xinyi Fan Weitao Li Bin Li Tianpeng Li Yuanqiang Wang Liang Wang Jia Liang College of Chemistry and Chemical Engineering Shanghai University of Engineering ScienceShanghai 201620People’s Republic of China Institute of Nanochemistry and Nanobiology School of Environmental and Chemical EngineeringShanghai UniversityShanghai 200444People’s Republic of China Department of Materials Science Fudan University220 Handan RoadShanghai 200433People’s Republic of China

Organic–inorganic halide perovskites have been intensively investigated as potential photovoltaic materials due to their exceptional optoelectronic properties and their successful applications in perovskite solar cells(PSCs).However,a large number of defect states still exist in the PSCs so far and are detrimental to their power conversion efficiencies(PCEs)and ***,an effective strategy of incorporating single-crystalline graphene quantum dots(GQDs)into the perovskite films is proposed to passivate the defect ***,the GQD-modified perovskite films exhibit purer phase structure,higher quality of morphology,and higher electrical conductivity when compared with the control perovskite *** of the advantages caused by the incorporation of the GQDs lead to fast carrier separation and transport,long carrier lifetime,and low nonradiative recombination in the PSCs based on the GQD-modified perovskite *** a result,this kind of PSC displays an increase in all photovoltaic parameters,and its PCE shows an enhancement of more than 20%when compared with the control ***,this novel PSC is demonstrated to have long-term stability and resistibility against heat and *** findings provide an insight into how to passivate the defect states and enhance the electrical conductivities in the perovskites and pave the way for their further exploration to achieve higher photovoltaic performances.

关键词： perovskite solar cells graphene quantum dots defect passivation

Synergistic defect passivation and strain compensation toward efficient and stable perovskite solar cells

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Journal of Energy Chemistry 2024年第11期98卷 327-333页

作者： Liqiang Bian Zhe Xin Yuanyuan Zhao Lei Gao Zhi Dou Linde Li Qiyao Guo Jialong Duan Jie Dou Yingli Wang Xinyu Zhang Chi Jiang Liqing Sun Qiang Zhang Qunwei Tang College of Energy Storage Technology Shandong University of Science and TechnologyQingdao 266590ShandongChina College of Mechanical and Electronic Engineering Shandong University of Science and TechnologyQingdao 266590ShandongChina Ural Institution North China University of Water Resources and Electric PowerZhengzhou 450045HenanChina Institute of Carbon Neutrality College of Chemical and Biological EngineeringShandong University of Science and TechnologyQingdao 266590ShandongChina

Rational interface engineering is essential for minimizing interfacial nonradiative recombination losses and enhancing device ***,we report the use of bidentate diphenoxybenzene(DPOB)isomers as surface modifiers for perovskite *** DPOB molecules,which contain two oxygen(O)atoms,chemically bond with undercoordinated Pb^(2+) on the surface of perovskite films,resulting in compression of the perovskite *** chemical interaction,along with physical regulations,leads to the formation of high-quality perovskite films with compressive strain and fewer *** compressive strain-induced band bending promotes hole extraction and transport,while inhibiting charge recombination at the ***,the addition of DPOB will reduce the zero-dimensional(OD) Cs_4PbBr_6 phase and produce the two-dimensional(2D) CsPb_(2)Br_5 phase,which is also conducive to the improvement of device ***,the resulting perovskite films,which are strain-released and defect-passivated,exhibit exceptional device efficiency,reaching 10.87% for carbon-based CsPbBr_(3) device,14.86% for carbon-based CsPbI_(2)Br device,22,02% for FA_(0.97)Cs_(0.03)PbI_(3) device,***,the unencapsulated CsPbBr_(3) PSC exhibits excellent stability under persistent exposure to humidity(80%) and heat(80℃) for over 50 days.

关键词： Perovskite solar cells Nonradiative recombination Chemical interaction defect passivation Strain engineering

NH_(4)PF_(6) assisted buried interface defect passivation for planar perovskite solar cells with efficiency exceeding 21%

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Rare Metals 2023年第10期42卷 3399-3409页

作者： Xing-Dong Ding Xiao-Wen Zhou Jin-Wei Meng Hao-Xin Wang Tai Wu Yong Hua Cheng Chen Ming Cheng Institute for Energy Research School of Energy and Power EngineeringJiangsu UniversityZhenjiang212013China Yunnan Key Laboratory for Micro/Nano Materials&Technology School of Materials and EnergyYunnan UniversityKunming650091China

The buried interface defects severely affect the further enhancements of efficiency and stability of SnO_(2)-based planar perovskite solar cells(PSCs).To well tackle this problem,we propose a passivation strategy employing NH_(4)PF_6 to modify the buried interface of perovskite layer((FAPbI_(3))_(0.85)(MAPbBr_(3))_(0.15) composition) in planar *** introducing NH_(4)PF_(6),the oxygen defects on the surface of SnO_(2) film are greatly restricted due to the coordinate interaction between fluorine atoms(F) in PF_(6)^(-)and undercoordinated Sn^(4+).Meanwhile,the hydrogen bonding interaction(N-H…I) between NH_(4)PF_(6) and PbI_(2) can passivate the non-radiative charge recombination sites,significantly optimizing the quality of perovskite film,as well as the charge transfer process at the SnO_(2)/perovskite *** a result,the NH_(4)PF_(6)-modified PSC obtains a champion power conversion efficiency(PCE) of 21.11%superior to the reference device(18.46%),and the device with an active area of 1 cm^(2) achieves a PCE as high as17.38%.Furthermore,the unencapsulated NH_(4)PF_(6)-modified PSCs show good humidity stability and retain about80% of the initial PCE after 1080 h aging at the relative humidity(RH) of 35% ± 5%.

关键词： defect passivation Interface engineering Surface charge transfer Stability Perovskite solar cells(PSCs)

Simultaneously enhanced moisture tolerance and defect passivation of perovskite solar cells with cross-linked grain encapsulation

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Journal of Energy Chemistry 2021年第5期30卷 455-462页

作者： Ke Xiao Qiaolei Han Yuan Gao Shuai Gu Xin Luo Renxing Lin Jia Zhu Jun Xu Hairen Tan National Laboratory of Solid State Microstructures Jiangsu Key Laboratory of Artificial Functional MaterialsCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093JiangsuChina School of Electronics Science and Engineering Nanjing UniversityNanjing 210093JiangsuChina

The grain surfaces(film surface and grain boundary)of polycrystalline perovskite films are vulnerable sites in solar cells since they pose a high defect density and initiate the degradation of perovskite *** simultaneously defect passivation and grain protection from moisture is crucial for the viability of perovskite solar ***,an in situ cross-linked grain encapsulation(CLGE)strategy that improves both device stability and defect passivation is ***-linkable semiconducting small molecules are mixed into the antisolvent to uniformly form a compact and conducting cross-linked layer over the grain *** cross-linked coating layer not only passivates trap states and facilitates hole extraction,but also enhances the device stability by preventing moisture *** the CLGE strategy,a high power conversion efficiency(PCE)of 22.7%is obtained in 1.55-eV bandgap planar perovskite solar *** unencapsulated devices with CLGE exhibit significantly enhanced device stability again moisture and maintain>90%of their initial PCE after shelf storage under ambient condition for over10,000 h.

关键词： Perovskite solar cell Cross-link defect passivation Stability Moisture tolerance

Role of self-assembled molecules’anchoring groups for surface defect passivation and dipole modulation in inverted perovskite solar cells

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Chinese Physics B 2024年第10期33卷 108-115页

作者： Xiaoyu Wang Muhammad Faizan Kun Zhou Xinjiang Wang Yuhao Fu Lijun Zhang Key Laboratory of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China State Key Laboratory of Integrated Optoelectronics Key Laboratory of Automobile Materials of MOECollege of Materials Science and EngineeringJilin UniversityChangchun 130012China

Inverted perovskite solar cells have gained prominence in industrial advancement due to their easy fabrication,low hysteresis effects,and high *** these advantages,their efficiency is currently limited by excessive defects and poor carrier transport at the perovskite-electrode interface,particularly at the buried interface between the perovskite and transparent conductive oxide(TCO).Recent efforts in the perovskite community have focused on designing novel self-assembled molecules(SAMs)to improve the quality of the buried ***,a notable gap remains in understanding the regulation of atomic-scale interfacial properties of SAMs between the perovskite and TCO *** understanding is crucial,particularly in terms of identifying chemically active anchoring *** this study,we used the star SAM([2-(9H-carbazol-9-yl)ethyl]phosphonic acid)as the base structure to investigate the defect passivation effects of eight common anchoring groups at the perovskite-TCO *** findings indicate that the phosphonic and boric acid groups exhibit notable *** groups fulfill three key criteria:they provide the greatest potential for defect passivation,exhibit stable adsorption with defects,and exert significant regulatory effects on interface *** anchoring groups exhibit enhanced passivation capabilities for defect energy levels due to their superior Lewis base properties,which effectively neutralize local charges near *** various defect types,iodine vacancies are the easiest to passivate,whereas iodine-substituted lead defects are the most challenging to *** study provides comprehensive theoretical insights and inspiration for the design of anchoring groups in SAMs,contributing to the ongoing development of more efficient inverted perovskite solar cells.

关键词： inverted perovskite solar cell defect passivation self-assembled molecule interface engineering first-principles calculation

Synchronous defect passivation of all-inorganic perovskite solar cells enabled by fullerene interlayer

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Nano Research Energy 2023年第3期2卷 16-24页

作者： Yanbo Shang Pu Wang Lingbo Jia Xingcheng Li Weitao Lian Peisen Qian Muqing Chen Tao Chen Yalin Lu Shangfeng Yang CAS Key Laboratory of Materials for Energy Conversion Anhui Laboratory of Advanced Photon Science and TechnologyDepartment of Materials Science and EngineeringUniversity of Science and Technology of ChinaHefei 230026China School of Environment and Civil Engineering Dongguan University of TechnologyDongguan 523808China

All-inorganic CsPbI_(3-x)Br_(x)perovskite solar cells(PSCs)are advantageous in terms of high thermal stability,while its efficiency lags behind those of organic-inorganic hybrid perovskite *** passivations have been extensively applied for enhancing efficiency of all-inorganic PSCs,which are mainly based on univocal defect passivation of perovskite ***,we incorporated a bis-dimethylamino-functionalized fullerene derivative(abbreviated as PCBDMAM)as an interlayer between ZnO electron transport layer(ETL)and all-inorganic CsPbI_(2.25)Br_(0.75)perovskite layer,accomplishing synchronous defect passivations of both layers and consequently dramatic enhancements of efficiency and thermal stability of PSC *** spin-coating PCBDMAM onto ZnO ETL,the surface defects of ZnO especially oxygen vacancies can be effectively passivated due to the formation of Zn−N ionic *** addition,PCBDMAM incorporation affords effective passivation of Pb_(I)and I_(Pb)antisite defects within the atop perovskite layer as well via coordination bonding with Pb^(2+).As a result,the regular-structure planar CsPbI_(2.25)Br_(0.75)PSC device delivers a champion power conversion efficiency(PCE)of 17.04%,which surpasses that of the control device(15.44%).Moreover,the PCBDMAM-incorporated PSC device maintains~80%of its initial PCE after 600 h heating at 85°C hot plate in N2 atmosphere,whereas PCE of the control device degrades rapidly to~62%after 460 h heating under identical ***,PCBDMAM incorporation benefited dramatic improvement of the thermal stability of PSC device.

关键词： all-inorganic perovskite solar cells fullerene derivative electron transport layer thermal stability defect passivation